[PATCH 1/3] page-flags: record page flag overlays explicitly

From: Andy Whitcroft
Date: Fri May 23 2008 - 12:33:32 EST

Some page flags are used for more than one purpose, for example
PG_owner_priv_1. Currently there are individual accessors for each user,
each built using the common flag name far away from the bit definitions.
This makes it hard to see all possible uses of these bits.

Now that we have a single enum to generate the bit orders it makes sense
to express overlays in the same place. So create per use aliases for
this bit in the main page-flags enum and use those in the accessors.

Signed-off-by: Andy Whitcroft <apw@xxxxxxxxxxxx>
include/linux/page-flags.h | 12 +++++++++---
1 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 590cff3..2cc1fb1 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -96,7 +96,13 @@ enum pageflags {
PG_uncached, /* Page has been mapped as uncached */
+ /* Filesystems */
+ PG_checked = PG_owner_priv_1,
+ /* XEN */
+ PG_pinned = PG_owner_priv_1,

@@ -155,8 +161,8 @@ PAGEFLAG(Dirty, dirty) TESTSCFLAG(Dirty, dirty) __CLEARPAGEFLAG(Dirty, dirty)
PAGEFLAG(Active, active) __CLEARPAGEFLAG(Active, active)
__PAGEFLAG(Slab, slab)
-PAGEFLAG(Checked, owner_priv_1) /* Used by some filesystems */
-PAGEFLAG(Pinned, owner_priv_1) TESTSCFLAG(Pinned, owner_priv_1) /* Xen */
+PAGEFLAG(Checked, checked) /* Used by some filesystems */
+PAGEFLAG(Pinned, pinned) TESTSCFLAG(Pinned, pinned) /* Xen */
PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved)
PAGEFLAG(Private, private) __CLEARPAGEFLAG(Private, private)
__SETPAGEFLAG(Private, private)
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